Send splice commit_sigs as a batch
#787
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We introduce a `CommitSigBatch` class to group `commit_sig` messages when splice transactions are pending. We use this class to ensure that all the `commit_sig` messages in the batch are sent together to our peer, without any other messages in-between. When we receive `commit_sig` messages that contain the `batch` TLV, we group them directly in the `PeerConnection` before relaying them as a batch to the channel.
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pm47
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Oct 1, 2025
modules/core/src/commonMain/kotlin/fr/acinq/lightning/channel/Commitments.kt
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modules/core/src/commonMain/kotlin/fr/acinq/lightning/io/Peer.kt
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modules/core/src/commonMain/kotlin/fr/acinq/lightning/wire/LightningMessages.kt
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pm47
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There has been some discussion on the splicing spec around batching the set of
commit_sigmessages that are sent while a splice is ongoing (see lightning/bolts@b5b5572).In this PR, we ensure that our
commit_sigmessages are sent as a batch (no other messages can be interleaved betweencommit_sigmessages). We also receivecommit_sigmessages as a batch, which means we must wait for ACINQ/eclair#3083 to be deployed before merging this PR.We don't yet implement the
start_batchmessage that was introduced in the BOLTs: this will be done onceeclairsupports it and the spec PR is merged (see #768).